javascript - 在 Node.js 中仅连接一次配置变量

Question

我有一些文件:

tags.js:

var express = require('express'),
    router = express.Router(),
    monk = require('monk'),
    db = monk('localhost:27017/data');

...

module.exports = router;

records.js:

var express = require('express'),
    router = express.Router(),
    monk = require('monk'),
    db = monk('localhost:27017/data');

...

module.exports = router;

users.js:

var express = require('express'),
    router = express.Router(),
    monk = require('monk'),
    db = monk('localhost:27017/data');

...

module.exports = router;

我总是必须复制我的标题:

var express = require('express'),
    router = express.Router(),
    monk = require('monk'),
    db = monk('localhost:27017/data');

连接此配置变量一次的最佳解决方案是什么？

<小时/>

我尝试这个变体In Node.js, how do I "include" functions from my other files? ，但这不起作用，因为我应该在tools.js中使用require(例如:require('express'))，但我得到了错误。

我也尝试过这个变体node.js - accessing required variables from other files :

工具包.js:

var express = require('express'),
    router = express.Router(),
    monk = require('monk'),
    db = monk('localhost:27017/data');

tags.js:

var tools = require('../toolkit'),
    router = tools.router;

router.get('/', function(req, res) {
...
});

module.exports = router;

但我又出错了。

Answer 1

您需要从 toolkit.js 导出。因此，您的工具包将如下所示

var express = require('express');
exports.router = express.Router();
var monk = require('monk');
exports.db = monk('localhost:27017/data');

现在，您可以执行以下操作:

var toolkit = require('path/to/toolkit');
var router = toolkit.router;
var db = toolkit.db;